영국게 미국 배우. 그녀는 로얄 셰익스피어 극단의 단원이며 <Herry Potter> 시리즈에 출연하였고, TV 시트콤 <My Family>에 수잔 하퍼의 역할을 맡았다.
워너메이커는 뉴욕에서 태어났으며, 여배우이면서 라디오 진행자로 활동하였던 샤롯 홀랜드의 딸이기도 하다.
워너메이커는 로1976년부터 1984년까지 열 셰익스피어 극단의 단원으로 있었다. 또한, 1980년대에는 영화에도 진출하였고, TV 드라마에도 출연하게 된다. 영화 <Harry Potter and the Philosopher/s Stone>에 후치부인으로 출연하였다.

Film <The Devil's Disciple, 1976> Actress
<Wild Oats; or, The Strolling Gentleman, 1976> Actress
<Ivanov, 1976> Actress
<The Taming of the Shrew, 1978> Actress
<Captain Swing, 1978> Actress
<Piaf, 1978> Actress
<Once in a Lifetime, 1979> Actress
<Piaf, 1981> Actress
<The Importance of Being Earnest, 1982> Actress
<The Time of Your Life, 1983> Actress
<Twelfth Night, 1983> Actress
<Comedy of Errors, 1983> Actress
<Mother Courage, 1984> Actress
<Wrecked Eggs, 1986> Actress
<The Bay at Nice, 1986> Actress
<Loot City, 1986> Actress
<Mrs. Klein, 1988-1989> Actress
<Othello, 1989> Actress
<The Crucible, 1990> Actress
<The Last Yankee, 1993> Actress
<Dead Funny, New York City, 1994> Actress
<The Glass Menagerie, 1995> Actress
<Sylvia, Apollo Theatre, 1996> Actress
<The Old Neighborhood, 1997> Actress
<Electra, 1997, 1998-1999> Actress
<Henry V, Globe2000> Actress